Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

As of July 26,October 25, 2017, there were 16,211,16116,215,672 shares of common stock, no par value, outstanding.

See Notes to Consolidated Financial Statements.

The accompanying unaudited consolidated financial statements include the accounts of the Company, West Bank and West Bank's wholly-owned subsidiary WB Funding Corporation.  All significant intercompany transactions and balances have been eliminated in consolidation.  In accordance with GAAP, West Bancorporation Capital Trust I is recorded on the books of the Company using the equity method of accounting and is not consolidated.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). The guidance in the update supersedes the requirements in ASC Topic 840, Leases. The update will require business entitiesguidance is intended to recognizeincrease transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet for leases with lease terms of more than 12 months on their balance sheet and to disclose key information about leasing arrangements. A lessee would recognize a liability to make lease payments and a right-of-use asset representing its right to use the leased asset for the lease term.months. For public companies, this update will be effective for interim and annual periods beginning after December 15, 2018, and is to be applied on a modified retrospective basis. The Company currently leases its main location and space for six other branch offices and operational departments under operating leases that will result in recognition of lease assets and lease liabilities on the consolidated balance sheets under the ASU. The amount of assets and liabilities added to the balance sheet are not expected to have a material impact on the Company's consolidated financial statements per preliminary estimates.

In March 2016, the FASB issued ASU No. 2016-09, Compensation—Stock Compensation (Topic 718). The guidance in this update simplifies several aspects of accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The guidance also allows an entity to make an entity-wide accounting policy election to either estimate expected forfeitures or account for forfeitures as they occur. For public companies, the update was effective for annual periods beginning after December 15, 2016. Portions of the amended guidance were to be applied using a modified retrospective transition method, and others require prospective application. Upon adoption of this update on January 1, 2017, the Company made the accounting policy election to account for forfeitures as they occur. This resulted in no effect on the Company's consolidated financial statements, as prior stock-based compensation expense assumed no expected forfeitures. Also upon adoption, the Company changed the calculation of the assumed proceeds of the treasury stock method on a prospective basis to eliminate deferred taxes from the calculation. The net impact on the income statement is dependent upon the change in the Company's stock price from grant date to vesting date and cannot be predicted with any certainty. The requirement to report the excess tax benefit or shortfall related to settlements of share-based payment awards in earnings as an increase or decrease to tax expense has been applied to settlements occurring on or after January 1, 2017, and the impact of applying that guidance reduced reported income tax expense $244$285 for the sixnine months ended JuneSeptember 30, 2017.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments—Credit Losses (Topic 326). The amendments in this update require a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is a valuation account that is deducted from the amortized cost basis of the financial assets to present the net carrying value at the amount expected to be collected on the financial assets. The income statement reflects the measurement of credit losses for newly recognized financial assets, as well as the expected increases or decreases of expected credit losses that have taken place during the period. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount of financial assets. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances. The allowance for credit losses for purchased financial assets with a more-than-insignificant amount of credit deterioration since origination that are measured at amortized cost basis is determined in a similar manner to other financial assets measured at amortized cost basis; however, the initial allowance for credit losses is added to the purchase price rather than being reported as a credit loss expense. Only subsequent changes in the allowance for credit losses are recorded as a credit loss expense for these assets. Off-balance-sheet arrangements such as commitments to extend credit, guarantees, and standby letters of credit that are not considered derivatives under ASC 815 and are not unconditionally cancellable are also within the scope of this update. Credit losses relating to available-for-sale debt securities should be recorded through an allowance for credit losses. For public companies, the update is effective for annual periods beginning after December 15, 2019, including interim periods within those fiscal years. All entities may adopt the amendments in this update earlier as of fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. An entity will apply the amendments in this update on a modified retrospective basis through a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. The Company is currently planning for the implementation of this accounting standard. It is too early to assess the impact that this guidance will have on the Company's consolidated financial statements.

Basic earnings per common share are computed by dividing net income by the weighted average number of common shares outstanding for the period.  Diluted earnings per common share reflect the potential dilution that could occur if the Company's outstanding restricted stock units were vested. The dilutive effect was computed using the treasury stock method, which assumes all stock-based awards were exercised and the hypothetical proceeds from exercise were used by the Company to purchase common stock at the average market price during the period.  The incremental shares, to the extent they would have been dilutive, were included in the denominator of the diluted earnings per common share calculation.  The calculations of earnings per common share and diluted earnings per common share for the three and sixnine months ended JuneSeptember 30, 2017 and 2016 are presented in the following table.

The following tables show the amortized cost, gross unrealized gains and losses, and fair value of investment securities, by investment security type as of JuneSeptember 30, 2017 and December 31, 2016.

The amortized cost and fair value of investment securities available for sale as of JuneSeptember 30, 2017, by contractual maturity, are shown below. Certain securities have call features that allow the issuer to call the securities prior to maturity.  Expected maturities may differ from contractual maturities for collateralized mortgage obligations, mortgage-backed securities and asset-backed securities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.  Therefore, collateralized mortgage obligations, mortgage-backed securities and asset-backed securities are not included in the maturity categories within the following maturity summary.

The following tables show the fair value and gross unrealized losses, aggregated by investment type and length of time that individual securities have been in a continuous loss position, as of JuneSeptember 30, 2017 and December 31, 2016.